Firearm suppressor device

ABSTRACT

Embodiments of the present disclosure provide improvements in firearm suppressor devices and methods of use therefor with small and large caliber rifles.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Provisional Application No.61/751,715 filed Jan. 11, 2013, the disclosure of which is herebyexpressly incorporated in its entirety by reference herein.

FIELD OF USE

Embodiments of the present disclosure find applicability in the field offirearms. One useful field includes small and large caliber riflesbenefitting from the use of suppressor devices.

BACKGROUND

Firearm suppressors are well known in the art for reducing the noisefrom expanding gases expelled by the firearm barrel upon firing.Functionally, suppressors in the art comprise a cylinder attached to theend of a barrel and having an interior space constructed in some way toimpede, disperse or convolute the longitudinal flow of gases as theytravel through the barrel so as to reduce the decibel level of the noiseproduced during firing.

U.S. Pat. Nos. 8,307,946 and 8,505,431 are illustrative of suppressorsin the art and their method of use. Because firearm suppressors addlength to a firearm, there remains an on-going desire to minimize theoverall length of the firearm suppressor, while still effectivelyreducing decibel levels to “safe hearing” levels, at least in the rangeof 120-130 decibels, and also attenuating the sound wave produced to aless sharp sound. Decreased suppressor device length allows for enhancedmobility and maneuverability with a firearm using an attached suppressordevice.

The present disclosure describes improvements in a firearm suppressorand method of use that overcomes deficiencies in the suppressors of theprior art.

SUMMARY

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This summary is not intended to identify key features ofthe claimed subject matter, nor is it intended to be used on its own asan aid in determining the scope of the claimed subject matter.

In accordance with one embodiment of the present disclosure, a firearmsuppressor having a reduced overall length, with sufficient internalvolume to achieve a decibel reduction in the range of at least about25-40 decibels, more preferably 28-35 decibels, is provided. Moreparticularly, the suppressors disclosed herein achieve at least a 1-inchreduction, and more preferably at least a 1.5 inch reduction in lengthover suppressors in the art while still achieving at least about a 28-35decibel reduction. As one example, where suppressor devices in the artsuitable for short barrel rifles range from about 6-9 inches, thesuppressor device disclosed herein achieve the same or better resultswith an overall length in the range of about 4.5-5.25 inches. As anotherexample, where suppressor devices in the art suitable for large caliberrifles range from about 12-18 inches, the suppressor devices disclosedherein achieve the same or better results with an overall length in therange of about 8 inches.

In accordance with another embodiment of the present disclosure, thefirearm suppressor device disclosed herein attenuates the sound waveproduced by the escaping gases expelled from the firearm to produce aless sharp sound.

In accordance with another embodiment of the present disclosure, thesuppressor device provided herein has utility for a .223 or 5.56 caliberfirearm.

In accordance with another embodiment of the present disclosure, thesuppressor device has an overall shape and weight that does notinterfere with a firearm's function. In one preferred embodiment, thesuppressor device of the present disclosure has an overall diameter thatdoes not interfere with use of a firearm's optics or hand guard. Inanother embodiment, the suppressor device disclosed herein has anoverall diameter in the range of about 1.875-2.125 inches. In anotherembodiment, the suppressor device has an overall diameter in the rangeof about 2 inches.

In accordance with another embodiment of the present disclosure, asuppressor device is provided having an internal volume in the range ofabout 7-11 inches of gas volume. In another embodiment the suppressordevice has an internal volume in the range of about 8.25 inches of gasvolume.

In accordance with another embodiment of the present disclosure, asuppressor device is provided that enhances a firearm's firingefficiency and functional speed by increasing the cyclic rate of thefirearm, allowing more bullets to move through the firearm faster. Inanother embodiment, the suppressor devices disclosed herein improvereliability of the firearm by more efficiently dispersing the expelledgases, thereby reducing the dwell time for internal pressures in thefirearm to drop to zero.

In accordance with another embodiment of the present disclosure, novelbaffle designs are provided that effectively disperse, trap and swirlgases that come in contact with the baffle surfaces thereby temporarilytrapping the gases and suppressing their forward movement through abarrel. In one embodiment the baffle design comprises a modification tothe rimmed K baffles of the art which comprise a cone-shaped portionhaving a rim at the narrow end of the cone and a central, longitudinalaxial opening through which gases and a fired bullet can pass. In themodified baffle provided herein, the conical shape of the K baffle isreplaced with a concave bell-shape, which enhances the swirling andretardation or impingement of forward gas movement through the device.In another embodiment, the cup or bell shaped surface creates a baffleof greater structural integrity than a standard k baffle of similardiameter. In another embodiment, the bell-shaped baffle provided hereincomprises at least one opening perpendicular to the central axialopening, preferably located at the rim and cone juncture, and throughwhich gases can pass, so as to laterally disperse gases and they movethrough the length of the suppressor device. In another embodiment, thebell-shaped baffle comprises a plurality of these lateral openings, morepreferably 1-10 openings. In another embodiment the juncture comprises2-5 openings. In one preferred embodiment, these openings have adiameter in the range of about 0.062-0.198 inches. In anotherembodiment, these openings have a diameter in the range of about 0.125inches. In still another embodiment, the bell-shaped baffle disclosedherein includes a boss posterior to baffle's rim and which serves toseat the baffle against another baffle or the primary blast chamber ofblast baffle at the posterior end of the device. In still anotherembodiment, the lateral edge of the rim may comprise one or moreopenings parallel to the longitudinal direction of the suppressor deviceand of a diameter sufficient to allow gas penetration. In one preferredembodiment, these openings have a diameter in the range of about0.062-0.198 inches. In another embodiment, these openings have adiameter in the range of about 0.125 inches. In another embodiment, adisc-shaped baffle is provided with a central axial opening for gasesand a fired bullet to pass through, and comprising a concave surface oneither side of the baffle and perpendicular to the axial opening. In apreferred embodiment the radius of anterior concave surface differs fromthe radius of the posterior concave surface. In another preferredembodiment, the radius of anterior concave surface is larger than theradius of the posterior concave surface. In still another embodiment,the radius of the posterior concave surface creates a boss surroundingthe axial opening on the posterior surface and which can seat the baffleagainst another baffle or into or against the blast baffle.

In accordance with another embodiment of the present disclosure, asuppressor device is provided comprising a hollow cylindrical tube thatserves as the main body of the device, a bottom cap that attaches to theposterior end of the main body, a first baffle or blast baffle that sitsanterior to the bottom cap, a plurality of secondary baffles that sitanterior to the blast baffle, and a front cap. Each of the bottom cap,blast baffle, secondary baffles and front cap comprise a central axialopening that together create a central axial opening through the mainbody and through which gases and a fired bullet can pass from thefirearm barrel through the suppressor device and out the anterior end ofthe front cap. In another embodiment, the first and secondary bafflescan comprise a range of baffle shapes. In one embodiment, the bottomcap, the main body, the first baffle and one or more secondary bafflescan be fabricated as one integral unit. In another embodiment, theentire suppressor device can be fabricated as a single integral unit. Instill another embodiment, a single integral unit suppressor device canbe fabricated by means of selective laser sintering. In still anotherembodiment, the front cap is threaded on to the anterior end of theintegral, single unit device, allowing replacement with other front capdesigns and allowing for caliber conversion options.

In accordance with another embodiment of the present disclosure, a frontcap is provided with an integral multi-function end. In one embodiment,the multi-function end comprises a glass-breaching attachment, a muzzlecompliance device and multi-faceted surface that reduces the capacityfor glare reflection off the surface of the device and undesiredobservation of the device from an opposing force. In another embodiment,the multi-faceted surface enhances concealment of the device comparedwith suppressor devices of the art. In another embodiment, the front capcan be fabricated as a separate component threaded to anterior end ofthe suppressor device hollow cylinder.

DESCRIPTION OF THE DRAWINGS

The foregoing aspects and many of the attendant advantages of thisdisclosure will become more readily appreciated as the same becomebetter understood by reference to the following detailed description,when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is an exploded view of a suppressor device in accordance withembodiments of this disclosure;

FIG. 2A is a side view of, and FIG. 2B is a cross-section of, thesuppressor device of FIG. 1;

FIGS. 3A, 3B, 3C and 3D illustrate, respectively, a bottom cap, firstbaffle, a second or secondary baffle, and a tube spacer in accordancewith the present disclosure, and wherein 3B and 3C illustrate twoembodiments of disc baffles disclosed herein;

FIG. 4 illustrates a front cap in accordance with embodiments of thepresent disclosure;

FIG. 5 A & B illustrate a bell baffle in accordance with one embodimentof the present disclosure;

FIG. 6 is a cross-section of another embodiment of a suppressor devicedisclosed herein and comprising a bell baffle;

FIG. 7 is a cross-section of another embodiment of a suppressor devicedisclosed herein and comprising a K baffle, and

FIG. 8 illustrates an assembled suppressor device in accordance withembodiments of the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure provide firearm suppressordevices, as well as baffles and front caps useful in these devices, andmethods of use of the baffles and suppressor devices, particularly insmall and large caliber rifles. In one embodiment, the baffles, frontcaps and suppressor devices have particular utility in a .223 or a 5.56caliber firearm. In fabricating the devices and components disclosedherein, it will be appreciated by those of ordinary skill in the artthat known materials of demonstrated utility in firearm suppressordevices and their components, including baffles and front caps, may beused. Examples of useful materials include, without limitation,stainless steel and titanium. As will be understood by those of ordinaryskill in the art, material considerations include minimizing weight andease of fabrication, while providing sufficient weight for functionaloperation without substantive, lasting deformation of components duringfiring. Different components of the device may be fabricated ofdifferent materials as the fabricator and firearm user prefer. In theembodiments disclosed herein, components and devices have beenfabricated out of titanium-based material.

Example 1

Referring to FIG. 1, illustrated is an exploded view of one suppressordevice of the present disclosure. In FIG. 2, the same device isillustrated assembled and in cross-section. This embodiment of thesuppressor comprises, from posterior to anterior end, a bottom cap 1,main body 5, tube spacer 2, first or blast baffle 3, one or more secondor secondary baffles 4, and a front cap 6. Each of the components of thedevice comprise a centrally located, axial opening such that when thecomponents are assembled the axial openings align to create a hollowaxial central throughpore parallel to the length of the suppressordevice and through which both a bullet and gases can pass when thesuppressor device is attached to a firearm barrel and the firearm isfired.

FIG. 3A illustrates an enlarged view of the bottom cap 1. In theexample, the bottom cap 1 has an external rim 10 at its posterior endwith an external diameter in the range of about 1.875 to 2.125-inches.In a preferred embodiment, this external diameter is in the range ofabout 2.0-inches. The edges of the axial opening 14 of the bottom cap 1further is internally threaded and anterior end of the opening comprisesa boss 16, the function of which is to provide a means for attaching theend cap to the anterior end of a firearm barrel. In one embodiment thisthreaded inner diameter of the bottom cap, competent to mate with afirearm barrel end, has a range of about ½-28 or ⅝-24. The bottom capfurther comprises a second, intermediate diameter 12 less than theexternal diameter 12 and which serves to create a lip between diameters10 and 12 of the component. The tube spacer 2 has an internal diameterlarger than the intermediate diameter 12 of the bottom cap, and smallerthan the bottom cap's external diameter 10. The bottom cap lip serves toseat the tube spacer 2 against the lip of the bottom cap when the deviceis assembled.

Referring to FIGS. 1 and 3D, the tube spacer 2 has an outer diameter inthe range of about 1.75 to 2.0 inches and a wall thickness in the rangeof about 0.02 to 0.25 inches. In another embodiment, the tube spaceouter diameter is in the range of about 1.875 inches, and a wallthickness in the range of about 0.030 inches. Useful tube spacer lengthsare in the range of about 0.70-1.00 inches. In one preferred embodiment,the tube spacer length is in the range of about 0.860 inches. The tubespacer 2 serves to offset the bottom cap and create space between theseated first baffle 3 and the main body 5 thereby allowing gas flow tomove laterally and back, thereby reducing gas pressure build-up.

Anterior to the tube spacer is the first baffle 3. Referring now toFIGS. 1 and 3B, the first baffle has the overall shape of a disc, with astraight edge wall or rim. Preferred disc baffles of the presentdisclosure have an outer diameter in the range of about 1.75 to 2.0inches. In one embodiment, the outer diameter is in the range of about1.875 inches. The first baffle 3 is sometimes also referred to as theblast baffle, to distinguish it from baffles placed anterior to it.Blast or first baffles can include features for seating the baffle inconnection with the bottom cap and/or managing impact from initial blastgases. The anterior and posterior faces of blast baffle 3 each have aconcave surface with a radius 18 from the outer edge of the baffle tothe outer edge of the central axial opening 14. The radial faces of thebaffle allow the expelling gases to swirl internally in the suppressor.Baffle face radii can be in the range of 0.125 to 4.000 inches. In oneembodiment, the radius on both the anterior and posterior face of thebaffle 3 is 0.50 inches. As will be appreciated by those of ordinaryskill in the art, the diameter of the central opening 14 can varydepending on the caliber of bullet chosen. In one embodiment, thecentral axial opening 14 has a diameter in the range of about 0.232 to0.264 inches. In another embodiment, the opening 14 has a diameter inthe range of about 0.244 inches. By varying the depth of the radius cutinto the face of the disc baffle, one can alter the gas flow around thebaffle surface. In one embodiment, the posterior face of the firstbaffle 3 has a reduced radius depth compared to the baffle's anteriorface. In another embodiment, the radius depth of baffle's posterior faceis in the range of 0.150 to 0.230 inches. In another embodiment, theradius depth of the baffle's posterior face is in the range of 0.200inches. In still another embodiment the front or anterior face of thefirst baffle has a radius depth in the range of about 0.150 to 0.250inches. In another embodiment, the anterior face has a radius depth inthe range of about 0.230 inches. As will be appreciated by those havingordinary skill in the art, varying the depth of the disc face radius cancreate a boss 16 of a given desired height, which can furtherbeneficially impact gas flow.

Referring now to FIGS. 1 and 3C, anterior to the first or blast baffle,are one or more secondary baffles 4. As will be appreciated by those ofordinary skill in the art, the number of desired secondary bafflesselected will depend on the length of the suppressor device and thedimensions chosen for the first baffle, tube space and bottom cap. Inthe embodiment illustrated in FIG. 1, five secondary baffles 4 areshown. The preferred secondary baffles also are disc baffles with astraight edge wall or rim. The anterior and posterior faces of secondarybaffles 4 each have a concave surface with a radius 18 from the outeredge of the baffle to the outer edge of the central axial opening 14.The radial faces of the baffle allow the expelling gases to swirlinternally in the suppressor. The secondary baffles have an outsidediameter in the range of 1.75 to 2.0 inches. In one embodiment the outerdiameter is in the range of about 1.875 inches. Baffle face radii can bein the range of 0.125 to 4.000 inches. In one embodiment, the radius onboth the anterior and posterior face of the baffle 3 is 0.50 inches. Aswill be appreciated by those of ordinary skill in the art, the diameterof the central opening 14 can vary depending on the caliber of bulletchosen. In one embodiment, the central axial opening 14 has a diameterin the range of about 0.232 to 0.264 inches. In another embodiment, theopening 14 has a diameter in the range of about 0.244 inches. By varyingthe depth of the radius cut into the face of the disc baffle, one canalter the gas flow around the baffle surface. In one embodiment, theposterior face of the secondary baffle 4 has a reduced radius depthcompared to the baffle's anterior face. In another embodiment, theradius depth of baffle's posterior face is in the range of 0.150 to0.250 inches. In another embodiment, the radius dept of the baffle'sposterior face is in the range of 0.230 inches. In still anotherembodiment the front or anterior face of the first baffle has a radiusdepth in the range of about 0.150 to 0.270 inches. In anotherembodiment, the anterior face has a radius depth in the range of about0.250 inches.

Referring now to FIG. 2, when the first and secondary baffles areassembled in the suppressor device, the arrangement of concave facesproduced by the baffles creates an ideal surface for dispersing,swirling, and reversing the direction of gas flow as it moves down thesuppressor device. The resulting gas flow pattern effectively impedesthe speed and pressure of gas build up thereby effectively reducingdecibel levels in the range of about 28-35 decibels and attenuating thesound wave produced.

Referring now to FIG. 1 and FIG. 4, last component in the assembly isthe front cap. The front cap comprises an integrated Breach/Compliancedevice 26. The front cap can be externally threaded to create aremovable component that is threaded onto the front end of thesuppressor device main body 5. Alternatively, the front cap can bewelded to the main body 5 to create a single, integral unit. In oneembodiment, the bottom cap has an external diameter in the range ofabout 1.875 to 2.125 inches. In another embodiment, the outer diameteris in the range of about 2.00 inches. Useful front cap lengths are inthe range of about 0.25 to 0.75 inches. In one embodiment, the length isin the range of about 0.57 inches. the inside diameter or axial opening14 is sufficient to provide clearance for a desired caliber of bullet.In one embodiment, the axial opening diameter is in the range of about0.232 to 0.264 inches. In another embodiment, the inside diameter is inthe range of about 0.244 inches. In a preferred embodiment the interioror posterior face of this cap defines a radius sufficient to allow gasflow that comes in contact with the radial surface to swirl internallyin the suppressor. In one embodiment the radius on the internal face isin the range of about 0.125 to 4.000 inches. In another embodiment, theradius is in the range of about 0.500 inches. The external face of thefront cap has optional V grooves 28 milled in the face, having a depthin the range of about 0.05 to 0.375 inches deep. In one embodiment thedepth is in the range of about 0.270 inches. The optional V groovesserve to minimize the reflective surface of the front cap, therebyreducing the possibility of undesired detection by an opposer.Additionally, the V groove effectively create a series of radiallydistributed chevrons that can function as a glass breaching attachmentand/or muzzle compliance device.

FIG. 8 illustrates an assembled suppressor device in accordance with oneembodiment of the present disclosure. In the embodiment illustrated, themain body 5 comprises a plurality of longitudinally distributed grooveswhich can be optionally included in the fabrication of a suppressordevice. The grooves can serve to reduce mass, reduce glare surface andprovide a means for grip ease.

Example 2

Referring now to FIGS. 6 and 7, two additional embodiments of suppressordevices are illustrated. In both figures a series of bobbin spoolbaffles are assembled, and at least one and preferably two additionalbaffles are added anterior to the bobbin spool baffles. In oneembodiment, the three spool bobbin baffles together define a “blastbuffer” 28, and the space between the internal face of the bottom cap 1and the first spool baffle defines a “blast chamber” 29. As with astandard spool bobbin, the bobbin spool baffles comprise a centralhollow stem flanked by a flat disc on either end, each disc having acentral axial opening that coincides with the inner diameter of thehollow stem, so as to allow passage of a bullet of a desired caliber. Ina preferred embodiment, the stem and/or the discs comprise a pluralityof openings 22 distributed along their surfaces so as to createopportunity for gas to move and disperse in all directions. In FIG. 7these additional baffle comprise K baffles. In FIG. 6 the conical shapeof the K baffle is replaced with a bowl or cup shape (see FIG. 5. Inboth the K and bell baffles, a rim or “saucer” 21 lies posterior to thecup or cone, and one or more openings 22 are distributed radially aboutthe juncture of the cup (cone) and saucer. In another embodiment, thesaucer comprises one more openings distributed on its face and/or on theits edge 24. In the devices illustrated in FIGS. 6 and 7, the K and bellshaped baffles are arranged with the bell or cone ends facing towardsthe front of the device. The back or posterior side of the baffle Theblast baffle comprises a boss 16. As will be appreciated by those ofordinary skill in the art, the K or bell baffle and the spool baffleseach comprise a centrally located axial opening 14 of a diametersufficient to allow passage of bullet of a desired caliber.

The suppressor devices of FIGS. 6 and 7 comprise a main blast chamber 26with relief hold ranging in size from 0.0625-0.250 inches in diameterperpendicular to the bore line ranging from 90 degrees to 49 degree, andhaving a recessed counter bore in the rear-most portion to serve as amechanical lock to assure proper alignment of the blast chamber incombination with the blast chamber walls which are machined as one solidunit instead of four individual components adding to the device'sstructural strength and integrity. The

The baffle designs disclosed herein increase the efficiency of theexpanding gasses and are belled to incorporate the inherent strengths ofthe bell as well as correspond with the baffle plates which are machinedwith a radius increasing the swirling or “venturi” gas flow effects within the system. The number and distribution of gas ports or openings 22and 24 increase gas expansion while still slowing the expanding gasesand cooling them to have a compounding affect with the micro swirling or“venturi” effects created by the disruption of gas flow. The increasedmulti-directional effects produced in the baffle design along with theeffects of gas disruption in the blast baffle cause expanding gasses tocollide further enhancing the effectiveness of the suppressor design.The baffles are designed in a way that will not let them be misalignedin the body of the suppressor and are mechanically locked in positioninside the recess in the front of the blast baffle 26 increasing therigidity and safety of this suppressor design over and above existingsuppressor designs.

The plurality of openings or pores 22 and 24 in the suppressor devicesdisclosed herein, particularly in the embodiments illustrated in FIGS. 6and 7, can range in number from about 25 to 100, more preferably 35-65.In one embodiment, the pores range in diameter from about 0.062 to 0.198inches. In another embodiment the pores have a diameter in the range ofabout 0.10 inches.

The new design of the front cap 6 has an integral multi-function endthat serves as a glass breaching attachment, muzzle compliance device aswell as the third feature serving to break-up the solid uninterrupteddisc front of most suppressors reducing the chance of glare andincreasing the concealability of the weapon system from observation bythe opposing force. The pain compliance device is designed in such amanner as to prevent the possibility of penetrating injuries to theintended aggressor offering and instant non-lethal alternative while theoperator is able to maintain both hands on his primary weapon and hiseyes on the aggressor, potentially preserving life of both involvedparties. The integral multi-function front cap can be removable with athreaded section that would allow the replacement with other designstyles and variations as well as offering a caliber conversion optionnot presently available in the market. This feature allows thissuppressor to be reconfigured by the end user by the aid of a specialtool to accommodate various bullet diameters of the primary weapon.

The rear attachment point of the bottom cap is designed to interfacewith the weapon system via direct thread mount and/or by a quickattachment method. In one embodiment the quick attachment method isdesigned to interface with the NATO standard 22 mm flash hider. Inanother embodiment, the quick attachment method uses an interruptedthread design.

The main body 5 or external tube of the suppressor can comprises aseries of longitudinal grooves or a fluting pattern. These grooves orfluting increase the surface area of the external tube potentiating thecooling effects while also allowing a textured surface to assist withmounting and dismounting the suppressor. The external tube or main body5 also can have a ring for material placed at the end for the baffleassembly and permanently attached thereto, allowing for removal for themulti-function front cap while keeping the internal suppressorcomponents confined and aligned.

The efficiency of the internal blast chamber and baffle design allow fora dramatically smaller external dimension while still performing as wellas current suppressor designs which are much longer in length.

In one embodiment, the internal components are designed and fabricatedto reduce the number of parts to a minimum by combining parts through aprecision machining process and/or a selective laser sintering process,increasing the reliability and robustness of the suppressor design.

Embodiments of this disclosure may be embodied in other specific formswithout departing from the spirit or essential characteristics thereof.The present embodiments are therefore to be considered in all respectsas illustrative and not restrictive, the scope of the disclosure beingindicated by the appended claims rather than by the foregoingdescription, and all changes that come within the meaning and range ofequivalency of the claims are therefore intended to be embraced therein.While illustrative embodiments have been illustrated and described, itwill be appreciated that various changes can be made therein withoutdeparting from the spirit and scope of the disclosure. In particular,with respect to the above description, it is to be realized that theoptimum dimensional relationships for the parts of the disclosedembodiments and implementations, to include variations in size,materials, shape, form, function and manner of operation, assembly anduse, are deemed readily apparent and obvious to one skilled in the artin light of the foregoing disclosure, and all equivalent relationshipsto those illustrated in the drawings and described in the specificationare intended to be encompassed by the present disclosure. Therefore, theforegoing is considered as illustrative only of the principles of thedisclosure. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe disclosed subject matter to the exact construction and operationshown and described, and accordingly, all suitable modifications andequivalents may be resorted to that fall within the scope of the claims.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:
 1. A firearm suppressordevice having an overall length of less than 8 inches and comprising:(a) a main body, a bottom cap, and a front cap, the improvement whereina series of baffles are assembled within said main body and comprising aplurality of holes that disperse and impede the forward movement of gasflow through said suppressor device sufficient to reduce the firingdecibel level by at least 28 decibels.